1. Dating first cases of COVID-19
2. Centers for Disease Control and Prevention. CDC Museum Covid-19 Timeline; 2022. Centers for Disease Control and Prevention. Available from: https://www.cdc.gov/museum/timeline/covid19.html. Accessed January 12, 2022.
3. Centers for Disease Control and Prevention. CDC Covid Data tracker. Centers for Disease Control and Prevention. Available from: https://covid.cdc.gov/covid-data-tracker/#cases_casesper100klast7days. Accessed January 12, 2022.
4. Social Vulnerability and Racial Inequality in COVID-19 Deaths in Chicago
5. COVID-19 and social distancing